HI there..

Ok.. been playing around for a bit lately with some 4.3" and 5.0" CN GPS units.. Video Quality is OK, but Not great as the LCD screens in the GPS unit are normally pretty cheap with Tight viewing angles, Low bit converters etc.

Anyways, AV IN Details for Most units I've played with is as Follows:

The Plug is a Standard 2.5mm 4 segment: probably source a molded one from ebay/ phone shop /ipod etc.. chop the lead, splice to camera cabling etc..



Connections are:

1 - Right Audio In (RED)
2 - Left Audio In (WHITE or BLACK)
3 - Video In (YELLOW)
4 - Common Ground for ALL Input Lines

If the above Pin-out Doesn't work, Try connecting the Camera Output (or any Video Source really) to either pins 1,2 or 3 till it switches and You can See Video on the GPS LCD..

From 30 years of playing with AV stuff, You shouldn't really damage anything with a few seconds of Quick connection to confirm or deny you've got the right Pin ( or segment) on the 2.5mm plug.

Once the Unit Has a Video Signal connected to it ( and normally, no matter what is application or s/w is running on the GPS unit, ie. Nav, Games, Apps, the Win CE desktop, whatever...), It will switch to AV In Mode.. You'll get Video and Audio.. If the unit has a Thumb-wheel style Volume control on it use that to control Volume, If not, the Audio will eithr path thro at 100% volume or Maybe determined by current volume setting in s/w running, or Win CE Sound settings..

Finally, Obviously the Audio will sound pretty crappy and the L+R Channel are mixed as the unit only have One speaker internally, but "should" send L+R to the Earphone Jack (3.5mm) Audio Output.. most schematics I've seen feed the Stereo Audio thro to the Audio Output jack, via some amplification circuitry obviously..

Good Luck..

Hope this helps you out..

GPSMAD.

	USB connector pinout	computer bus specification

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4 pin USB A or USB B plug connector at the peripherals

USB (Universal Serial Bus) designed to connect peripherals such as mice, keyboards, scanners, digital cameras, printers, hard disks, and networking components to PC. It has become the standard connection method for scanners, digital cameras and for some printers. Complete pinout. Universal Serial Bus (USB) is a specification to establish communication between devices and a host controller (usually personal computers). An USB system consists of a host controller and multiple devices connected in a tree-like fashion using special hub devices. Hubs may be cascaded, up to 5 levels. Up to 127 devices may be connected to a single host controller. USB can connect computer peripherals such as mice, keyboards, digital cameras, PDA, mobile phones, printers, personal media players, flash drives, GPS, Network Adapters, and external hard drives. For many of those devices, USB has become the standard connection method.  USB interface aimed to remove the need for adding expansion cards into the computer's PCI or PCI-Express bus, and improve plug-and-play capabilities by allowing devices to be hot swapped or added to the system without rebooting the computer.   The USB Pinout: Pin Name Cable color Description 1 VCC Red +5 VDC 2 D- White Data - 3 D+ Green Data + 4 GND Black Ground Pin x of mini-USB connector may be not connected, connected to GND or used as attachment identification at some portable devices. USB connectors There are several types of USB connectors. The original USB specification detailed Standard-A and Standard-B plugs and receptacles. Nowdays there are 7 USB connectors known: Standard-A, Standard-B, Mini-A, Mini-B, Micro-A, Micro-AB, Micro-B.    USB pinout signals USB is a serial bus. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout). NRZI (Non Return to Zero Invert) encoding scheme used to send data with a sync field to synchronise the host and receiver clocks. In USB data cable Data+ and Data- signals are transmitted on a twisted pair. No termination needed. Half-duplex differential signaling helps to combat the effects of electromagnetic noise on longer lines. Contrary to popular belief, D+ and D- operate together; they are not separate simplex connections. USB transfer modes Univeral serial bus supports Control, Interrupt, Bulk and Isochronous transfer modes. USB transfer rates: Low Speed, Full Speed, Hi-speed. When the new device first plugs in, the host enumerates it and loads the device driver necessary to run it. The loading of the appropriate driver is done using a PID/VID (Product ID/Vendor ID) combination supplied by attached hardware. The USB host controllers has their own specifications: UHCI (Universal Host Controller Interface), OHCI (Open Host Controller Interface) with USB 1.1, EHCI (Enhanced Host Controller Interface) is used with USB 2.0. USB supports four data rates: Low Speed (1.5 Mbit per second) that is mostly used for Human Input Devices (HID) such as keyboards, mice, joysticks and often the buttons on higher speed devices such as printers or scanners; Full Speed (12 Mbit per second) which is widely supported by USB hubs, assumes that devices divide the USB bandwidth between them in a first-come first-serve basis - it's easy to run out of bandwidth with several devices; Hi-Speed (480 Mbit per second) was added in USB 2.0 specification. Not all USB 2.0 devices are Hi-Speed. SuperSpeed (USB 3.0) rate of 4800 Mbit/s (~572 MB/s). A USB device must indicate its speed by pulling either the D+ or D- line high to 3.3 volts. These pull up resistors at the device end will also be used by the host or hub to detect the presence of a device connected to its port. Without a pull up resistor, USB assumes there is nothing connected to the bus. The new USB 3.0 standard, supports an extended speed of 4.8Gbit per second. In order to help user to identify maximum speed of device, a USB device often specify its speed on its cover with one of USB special marketing logos. USB Hi-speed devices Hi-Speed devices should fall back to the slower data rate of Full Speed when plugged into a Full Speed hub. Hi-Speed hubs have a special function called the Transaction Translator that segregates Full Speed and Low Speed bus traffic from Hi-Speed traffic. USB powered devices The USB connector provides a single 5 volt wire from which connected USB devices may power themselves. A given segment of the bus is specified to deliver up to 500 mA. This is often enough to power several devices, although this budget must be shared among all devices downstream of an unpowered hub. A bus-powered device may use as much of that power as allowed by the port it is plugged into. Bus-powered hubs can continue to distribute the bus provided power to connected devices but the USB specification only allows for a single level of bus-powered devices from a bus-powered hub. This disallows connection of a bus-powered hub to another bus-powered hub. Many hubs include external power supplies which will power devices connected through them without taking power from the bus. Devices that need more than 500 mA or higher than 5 volts must provide their own power. When USB devices (including hubs) are first connected they are interrogated by the host controller, which enquires of each their maximum power requirements. However, seems that any load connected to USB port may be treated by operating system as device. The host operating system typically keeps track of the power requirements of the USB network and may warn the computer's operator when a given segment requires more power than is available and may shut down devices in order to keep power consumption within the available resource. USB power usage: Bus-powered hubs: Draw Max 100 mA at power up and 500 mA normally. Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port. Low power, bus-powered functions: Draw Max 100 mA. High power, bus-powered functions: Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port. Self-powered functions: Draw Max 100 mA. Suspended device: Max 0.5 mA Dedicated charger mode: A simple USB charger should short the 2 data lines together. The device will then not attempt to transmit or receive data, but can draw up to 1.8A, if the supply can provide it. USB voltage: Supplied voltage by a host or a powered hub ports is between 4.75 V and 5.25 V. Maximum voltage drop for bus-powered hubs is 0.35 V from its host or hub to the hubs output port. All hubs and functions must be able to send configuration data at 4.4 V, but only low-power functions need to be working at this voltage. Normal operational voltage for functions is minimum 4.75 V. USB cable shielding: Shield should only be connected to Ground at the host. No device should connect Shield to Ground. USB cable wires: Shielded: Data: 28 AWG twisted Power: 28 AWG - 20 AWG non-twisted Non-shielded: Data: 28 AWG non-twisted Power: 28 AWG - 20 AWG non-twisted Power Gauge Max length 28 0.81 m 26 1.31 m 24 2.08 m 22 3.33 m 20 5.00 m

	USB cable schematic connector pinout	serial interface cable

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4 pin USB A / USB B / mini-USB jack connector	Very simple. Maximum length of cable is about 5 m for AWG20 and 0.8 m for AWG28 cable. Pin one side Signal Description Pin other side 1 USB Vcc (Vbus) usually RED, wire should be 20-28 AWG 1 2 USB Data - usually WHITE, wire should be 28 AWG 2 3 USB Data + usually GREEN, wire should be 28 AWG 3 4 GND usually BLACK, wire should be 20-28 AWG 4 USB D+ and D- are twisted in cable. Outer shell is made of copper braid and aluminum shield. Colors do not mean anything in the wiring scheme. You can use any color wire to rig something. Just make sure the colors match from end to end. Using the de-facto color is for industry types only. The maximum length of a standard USB cable (for USB 2.0 or earlier) is 5.0 metres (16.4 ft). The primary reason for this limit is the maximum allowed round-trip delay of about 1,500 ns. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost. The data cables for USB 1.x and USB 2.x use a twisted pair to reduce noise and crosstalk. USB 3.0 cables are more complex and employ shielding for some of the added data lines (2 pairs); a shield is added around the pair sketched.
	mini-USB connector pinout

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5 pin mini-USB plug connector at the peripherals

USB (Universal Serial Bus) designed to connect peripherals and exist in a wide variety of digital devices. Pin Name Cable color Description 1 VCC Red +5 VDC 2 D- White Data - 3 D+ Green Data + X ID   May be N/C, GND or used as an attached device presence indicator (shorted to GND with resistor) 4 GND Black Ground USB pinout signals USB is a serial bus. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout). NRZI (Non Return to Zero Invert) encoding scheme used to send data with a sync field to synchronise the host and receiver clocks. In USB data cable Data+ and Data- signals are transmitted on a twisted pair. No termination needed. Half-duplex differential signaling helps to combat the effects of electromagnetic noise on longer lines. Contrary to popular belief, D+ and D- operate together; they are not separate simplex connections. USB cable wires: Shielded: Data: 28 AWG twisted Power: 28 AWG - 20 AWG non-twisted Non-shielded: Data: 28 AWG non-twisted Power: 28 AWG - 20 AWG non-twisted Power Gauge Max length 28 0.81 m 26 1.31 m 24 2.08 m 22 3.33 m 20 5.00 m